Hello dear, Welcome to healthcaremagic. I have read read your query and understood your concern. It means you are getting recurrent fungal infection. One of the main reason for this is diabetes which you already have ruled out. The other possibility is inadequate treatment and sustained predisposing factor. I usually recommend my patients to take a course of oral antifungals like tab fluconazole 150 mg once a week for atleast 2 weeks along with topical therapies. Consideration can be given to start other drugs like itraconazole,terbinafine in non responsive cases. Keep the part clean and dry. With such details, this is my best advice for you. you can discuss it with your dermatologist, i hope he/she will agree with my opinion. Thanks.